Overview of erosion mechanisms, impurity transport, and deposition in TEXTOR and related modeling

• This paper gives an overview of the research activities at TEXTOR on impurity production, impurity transport through the plasma, and then deposition. First, laboratory experiments on chemical erosion by hydrogen and oxygen and radiation-enhanced sublimation are described, followed by the main part, which concentrates on the TEXTOR data of impurity release, impurity transport, and redeposition. The differences between the behavior of high-Z and low-Z materials are discussed. Many of the TEXTOR experiments are carried out using special limiter locks, but the overall carbon balance of net erosion sources and net deposition zones are also shown. Finally, modeling of erosion and dedicated transport experiments are addressed.

Nyckelord

erosion

impurity transport

deposition

radiation-enhanced sublimation

scrape-off-layer

chemical erosion

fusion devices

test-limiters

plasma edge

energy-distributions

pyrolytic-graphite

atomic-hydrogen

twin limiter

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)